Preventative care is free, and one major hospital visit can blow past $14,000 easily.
You ought to be able to set up a HSA to use pre-tax money for most of the non-premium costs, if you expect to spend thousands of dollars a year, or want to build up a tax-free nest egg in case you do in the future. I expect you can do this even if you plan to go without insurance.
You may be able to deduct your premiums as well, if they exceed 10% of your adjusted gross income; ie if your AGI is less than $76,560 for a $638/month plan.
"Not being insured" was the ONLY option for many, and will be again if the law is repealed. Any cost savings you realize in that system will be at the expense of people who actually need medical coverage (who may be a future you), and are therefore dropped.